How to Build Obstacle Avoiding Robot for Beginners With Arduino Tutorial

About: My name is Matthew and I attend the University of Pittsburgh. Currently I am a senior, going for a bachelors in Information Science with a minor in CS. Current interests include augmented reality, virtual re...
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This Tutorial is for anyone getting started with arduino. We will be building an obstacle avoiding robot that uses an ultrasonic HC SR-04 sensor to detect objects and 2 continuous (360 degree) servos wired to an external battery supply. This project uses an Arduino Uno without motor shield. The code is not mine, but not sure who to give credit to as I combined about 4 different sketches I found online.

Comment with any questions and sorry I said UMMM about 3000 times, I get nervous on camera...

I made the robot and it worked finally :) BUT now I went to use it again after it sat for 4 or 5 days and I went to show it to someone, and it only goes in circles. Can you maybe explain to me what I did wrong that this could happen? Thank you so much.

I do not believe those servos will work, they need to be labeled continuous or 360 degree to work for this tutorial. However, with some modification you can make it rotate continuously to work for this tutorial. Check this out https://www.youtube.com/watch?v=6G1nHfvl4aI